(−)-Spirotryprostatin B

(2S,3S,5aS)-3-(2-Methyl-1-propen-1-yl)-5a,6,7,8-tetrahydro-5H,10H-spiro[dipyrrolo[1,2-a:1′,2′-d]pyrazine-2,3′-indole]-2′,5,10(1′H)-trione

(−)-Spirotryprostatin B

Spiro[3H,5H-dipyrrolo[1,2-a:1′,2′-d]pyrazine-2(10H),3′-[3H]indole]-2′,5,10(1′H)-trione, 5a,6,7,8-tetrahydro-3-(2-methyl-1-propen-1-yl)-, (2S,3S,5aS)-

SPIROTRYPROSTATIN B